Fix English in description of GCC_PLUGIN_STRUCTLEAK

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Fixes: c61f13eaa1ee ("gcc-plugins: Add structleak for more stack initialization")
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>

arch/Kconfig

@@ -425,7 +425,7 @@ config GCC_PLUGIN_STRUCTLEAK
 	bool "Force initialization of variables containing userspace addresses"
 	depends on GCC_PLUGINS
 	help
-	  This plugin zero-initializes any structures that containing a
+	  This plugin zero-initializes any structures containing a
 	  __user attribute. This can prevent some classes of information
 	  exposures.